def anchorArticles(txt):
# find all textnodes starting with Article, wrapping this in a named <a> and prepending a hoverable link to this anchor
aregex=re.compile('^\s*Article\s+[0-9][0-9.,]*', re.I)
nsoup = BeautifulSoup(txt)
node=nsoup.find(text=aregex)
while node:
nodeidx=node.parent.contents.index(node)
match=str(re.match(aregex,node).group())
# create named <a>
name=match.replace(' ','_')
a=Tag(nsoup,'a',[('name',name)])
a.insert(0,match)
# create a link that is displayed if the <a> is hovered
link=Tag(nsoup,'a', [('class',"anchorLink"), ('href','#'+name)])
link.insert(0,"#")
# create a container for the a and the link
hover=Tag(nsoup,'span',[('class','hover')])
hover.insert(0,a)
hover.insert(0,link)
node.parent.insert(nodeidx,hover)
# cut the newly wrapped from the original node.
newNode=NavigableString(node[len(match):])
node.replaceWith(newNode)
node=newNode.findNext(text=aregex)
return str(nsoup)
